EMERGENCY SERVICES FOR PACKET NETWORKS

• US 20110128955A1
• Filed: 02/04/2011
• Published: 06/02/2011
• Est. Priority Date: 06/26/2003
• Status: Active Grant

• Current Assignee: RPX Clearinghouse LLC (RPX Corporation)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Constantinof, Cristian
• Granted Patent: US 8,737,594 B2
• Time in Patent Office: Days
• US Class Current: 370/352
• CPC Class Codes: H04L 65/1045 Proxies, e.g. for session initiation protocol [SIP]
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1079 of unsolicited session attempts, e.g. SPIT
• CPC Class Codes: H04M 2242/06 Lines and connections with preferential service
• CPC Class Codes: H04M 3/436 Arrangements for screening incoming calls , i.e. evaluating the characteristics of a call before deciding whether to answer it based on the calling party profile H04M3/42059; based on location H04M3/42348; based on presence H04M3/42365; diversion H04M3/54
• CPC Class Codes: H04M 3/5116 for emergency applications

Abstract

The present invention provides a technique for facilitating emergency services via packet networks. Emergency service providers will implement emergency proxies to ensure that proper call setup requests for emergency services are forwarded to the appropriate entities, even if those entities are in overload conditions. The emergency proxies may authenticate and filter call setup requests to ensure that only proper call setup requests are forwarded to help prevent such overload conditions. The emergency proxies may operate solely in a packet network, as well as at the interface between a packet network and a circuit-switched network to assist in call setup requests originating from either the packet network or the circuit-switched network.

Claims

1. A method of controlling access to an emergency service, comprising:

receiving at least one call setup request from at least one originating device;

determining whether a received call setup request is received from a user who is authorized to initiate a call to the emergency service;

selecting a priority level from a plurality of priority levels for the call setup request;

inserting at least one indication of the determination and the selected priority level into the call request; and

forwarding the call request including the at least one indication toward at least one terminating device associated with the emergency service, wherein at least one of the originating devices or terminating devices resides on a packet network.

2. A method as recited in claim 1, wherein received call setup requests determined to be received from users who are not authorized to initiate a call to the emergency service are not forwarded toward terminating devices associated with the emergency service.

3. A method as recited in claim 1, further comprising creating emergency information for each call setup request determined to be received from a user who is authorized to initiate a call to the emergency service;

wherein the step of inserting at least one indication of the determination and the selected priority level into the call request comprises inserting the emergency information into the call setup request.

4. A method as recited in claim 1, wherein the step of inserting at least one indication of the determination and the selected priority level comprises inserting the at least one indication of the determination and the selected priority level into a header of the call setup request.

5. A method as recited in claim 1, wherein the step of forwarding the call request is dependent on the step of determining whether the received call request is from a user who is authorized to initiate a call to the emergency service, at least when at least one network resource required to forward the call request toward the at least one terminating device or at least one of the terminating devices is in an overload condition.

6. A method as recited in claim 5, wherein a call request is not forwarded toward the at least one terminating device when the received call request is determined not to be from a user who is authorized to initiate a call to the emergency service.

7. A method as recited in claim 1, further comprising registering users authorized to initiate calls to the emergency service in response to received registration messages.

8. A method as recited in claim 1, further comprising processing the call setup request in accordance with the selected priority level at a network element upstream of at least one terminating device associated with the emergency service.

9. A method as recited in claim 1, wherein the call setup request is a request for a communication session of a type selected from the group consisting of data, audio, voice and video.

10. A system for controlling access to an emergency service, comprising:

at least one communication interface; and

a control system associated with the at least one communication interface and configured to;

receive at least one call setup request from at least one originating device;

determine whether a received call setup request is received from a user who is authorized to initiate a call to the emergency service;

select a priority level from a plurality of priority levels for the call setup request;

insert at least one indication of the determination and the selected priority level into the call request; and

forward the call request including the at least one indication toward at least one terminating device associated with the emergency service, wherein at least one of the originating devices or terminating devices resides on a packet network.

11. A system as recited in claim 10, wherein the control system is operable to not forward toward terminating devices associated with the emergency service received call setup requests determined to be received from users who are not authorized to initiate a call to the emergency service.

12. A system as recited in claim 10, wherein the control system is further operable:

to create emergency information for each call setup request determined to be received from a user who is authorized to initiate a call to the emergency service; and

to insert the emergency information into the call setup request.

13. A system as recited in claim 10, wherein the control system is operable to insert at least one indication of the determination and the selected priority level by inserting the at least one indication of the determination and the selected priority level into a header of the call setup request.

14. A system as recited in claim 10, wherein the control system is operable to forward the call request dependent on the determination of whether the received call request is authorized to initiate a call to the emergency service, at least when at least one network resource required to forward the call request toward the at least one terminating device or at least one of the terminating devices is in an overload condition.

15. A system as recited in claim 14, wherein the control system is operable to not forward a call request toward the at least one terminating device when the received call request is determined not to be from a user who is authorized to initiate a call to the emergency service.

16. A system as recited in claim 10, wherein the control system is further operable to register users authorized to initiate calls to the emergency service in response to received registration messages.

17. A system as recited in claim 10, further comprising at least one network element upstream of at least one terminating device associated with the emergency service, the network element being operable to process the call setup request in accordance with the selected priority level.

18. A non-transitory computer-readable medium carrying software for controlling access to an emergency service, the software comprising instructions executable by a processor to:

receive at least one call setup request from at least one originating device;

determine whether a received call setup request is received from a user who is authorized to initiate a call to the emergency service;

select a priority level from a plurality of priority levels for the call setup request;

insert at least one indication of the determination and the selected priority level into the call request; and

forward the call request including the at least one indication toward at least one terminating device associated with the emergency service;

wherein at least one of the originating devices or terminating devices resides on a packet network.

19. A computer-readable medium as recited in claim 18, wherein the instructions executable to forward the call request are executed dependent on the determination of whether the received call request is from a user who is authorized to initiate a call to the emergency service, at least when at least one network resource required to forward the call request toward the at least one terminating device or at least one of the terminating devices is in an overload condition.

20. A computer-readable medium as recited in claim 18, wherein the instructions further comprise instructions executable to register users authorized to initiate calls to the emergency service in response to received registration messages.